Right Lung, Horizontal Fissure Anatomy in 3D

A line that separates the upper and middle lobes of the right lung. Fluid can get trapped in this fissure (a "phantom tumor") on an X-ray, which can be mistaken for a lung mass.

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Related structures

Right Lung (Middle Lobe) Right Lung (SIV), Lateral Segment Right Lung (SV), Medial Segment Lung, Inferior Border Lung, Interlobar Surface Right Lung (SI), Apical Segment Right Lung (SII), Posterior Segment Right Lung BI (Apical Segmental Bronchus)